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Unit 34, Assignment 3 - Thermal Analysis & the Design of Heat Dissipaters (P4 & D1(Practical))
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- PEARSON (PEARSON)
BTEC Engineering Level 3
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Unit 34 Thermal Analysis & the Design of Heat Dissipaters Assignment3
In this new assignment, I will begin by explaining the need for thermal analysis & effective
heat dissipation for an electric circuit.
Firstly, the main function of thermal analysis is to
calculate the temperatures of parts within a giving
product. So, by picturing heat fluxes, thermal jams
as well as missed shortcut chances, the thermal
analysis looks to eradicate detected thermal
passivity issues, if there are any.
Additionally, the temperature predictions are vital
when it comes to other analysis disciplines too;
since there is quite a lot of real world engineering
materials that are recognised to have high
temperature dependant thermo-physical
belongings. Likewise, a very important effect is
the temperature, specifically when it comes to power distribution, timing signals as well as
signal reliability.
Thermal designers have been using CFD (Computational Fluid Dynamics) as this provides
3D thermal simulation results, which predict & show temperatures in & around electronic
product designs. Moreover, these designers regularly use calculated temperatures to critic
thermal compliance just by relating the simulated temperatures to maximum rated operating
temperatures. For example, if the operating temperature surpasses the maximum rated value,
then there’ll be at a minimum, a potential deprivation in the performance of the packaged IC
(Integrated Circuit).
Commonly, the alteration in thermo-physical assets for a substance
that is big enough across the estimated temperature range to be a
first order design effect. Thermal conductivity of silicon for
example decreases by about 20% as the temperature rises from 77
°C to roughly 127 °C.
Copper can also have a thermal
physical property change over the
predictable range of operating temperatures, for e.g. the electrical
resistivity of copper upsurges by about 4% every time the
temperature rises by 10 °C. The effect on the DC resistance of the
copper when the temperature heightens has a great impact on the
voltage drop as well as the current density.
Component placement usually involves trade-offs between thermal & electrical disciplines, &
the main placement is normally close together for electrical reasons, but this placement can
somewhat be in conflict with thermal management. So, when placing components together,
I’ll lead to a rise in power density as well as temperature amongst all components within the
group.
Additionally, there is a thermal rule
where components with the greatest
thermal management problems should be
placed near the edge of the circuit board
as it’ll receive the coolest air compared to
being somewhere further in the board.
P4 Fahim Mohammed
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